High-strength high-toughness spring steel wire and preparation process thereof

Abstract

The invention discloses a high-strength high-toughness spring steel wire and a preparation process thereof. The spring steel wire is prepared from the following raw materials in percentage by mass: 96.2-97% of Fe, 0.5-0.6% of C, 1.2-1.6% of Si, 0.6-0.8% of Mn, 0.6-0.8% of Cr, less than or equal to 0.015% of P, less than or equal to 0.015% of S and the balance of nonmetal impurities. The steel wireobtained by performing wire-drawing and processing on a wire rod is subjected to quenching tempering treatment to obtain the high-strength high-toughness spring steel wire; the spring steel wire prepared by the preparation process is subjected to cold-coiling and forming, stress-relief tempering treatment, surface shot blasting and pressing to obtain a spring with high permissible stress, and thespring can be used as an inner spring and a torsion bar structural member of an automobile clutch transmission device; and precious metal does not need to add into steel billets and dosage of alloy elements is small, and therefore, the steel billets are easily obtained, the cost is low and the energy consumption is little.

Description

technical field [0001] The invention relates to a high-strength and high-toughness spring steel wire and a preparation process thereof. Background technique [0002] With the increasingly severe situation of global environmental protection, the demand for energy conservation and environmental protection has penetrated into all walks of life, so more and more attention is paid to the lightweight of materials in the manufacturing process of automobiles and construction machinery. Springs are widely used in the automobile and construction machinery manufacturing industries. In order to meet the lightweight requirements of spring materials, spring materials are required to develop in the direction of high strength, high stress, and high fatigue life. The improvement of the tensile strength of the spring steel wire used to make the spring is conducive to the improvement of the allowable stress and fatigue life of the spring, and then realizes the material lightweight requirement ...

AI Technical Summary

Problems solved by technology

[0004] At present, spring steel wires with tensile strength ≥ 2000 MPa and certain plasticity can be manufactured at home and abroad basically by the following process: adding precious metals (such as Ti, V, Ni, Mo, W elements) to the blank, And appropriately increase the content of C and Mn. This traditional process will cause the consumption of precious metal resources and increase the energy consumption in the production process. The cost is high, the energy consumption is large, and the blank is not easy to obtain.